JPS612498A - Acoustic device for vehicle - Google Patents

Abstract

PURPOSE:To cuase a vehicle crew at the front section of a vehicle to hear sound in natural sense without spoiling the expansion of a stereo sound field, by providing a means which intensifies the level of the sound frequency band component among signals toward a front loud speaker in the vehicle or a means which attenuates the sound frequency band component toward the rear speaker of the vehicle. CONSTITUTION:A cancel switch 16 is composed of four interlocked changeover switches 16a- 16d and each veriable resistor of a front-to-back fader 6 is connected with the traveling contact of each change-over switch 16a-16d. Right- and left-channel signals passed through a right- left balancer 5 are divided into two parts, one for front side and the other for rear side, and passed through the front-to-back fader 6. The signals for the front side of both the right and left channels are supplied to equalizers 17 and 19 by means of the switch 16 and only the sound frequency band signal is amplified and signals of other bands are kept as they are. Then the signals are outputted from the right and left sides of the front section after they are amplified by output amplifies 7 and 9. The signals for the rear side are passed through BEFs 18 and 20 by means of the switch 16 in the same way and only the sound frequency band signal is attenuated and signals of other bands are kept as they are. Then the signals are outputted from the right and left sides of the rear section after they are amplified by output amplifiers 8 and 10. Therefore, the sound band signal can be localized to the front section and other band signals can be localized to the intermediate section as usual.

Description

[Detailed Description of the Invention] (Technical Field) The present invention is installed in a vehicle such as an automobile, and is equipped with a tuner that receives broadcasts, a cassette tape player that plays back cassette magnetic tape, etc., and controls the electrical signals from these devices. The present invention relates to a vehicle audio system that outputs sound after amplifying the sound.

(Prior art) Among this type of vehicle audio equipment, those with two channels of output signals to speakers have conventionally placed two or more speakers either in front or behind the vehicle occupants. There are also two or more speakers arranged at the front and the rear, and the present invention relates to the latter, which has a wider sound field.

As the latter type of vehicle acoustic device, there is conventionally one as shown in the block diagram of FIG. 4. In this vehicle audio system, the left and right channel signals from the stereo source 1, such as the corner that receives broadcasts and the cassette tape player that plays cassette magnetic tape, are 1-ah,
, Rch, are respectively supplied to an input amplifier 2.3 and amplified, the levels of these signals are adjusted simultaneously for the left and right channels using a volume 4, and then the left and right channel signal levels can be balanced by a left and right balancer 5.

The left and right channel signals that have passed through the balancer 5 are divided into front and rear signals, respectively, and the balance of the front and rear signal levels of the left and right channels can be adjusted at the same time using the front and rear faders 6, and the signals after such balance adjustment are adjusted. They are individually supplied to output amplifiers 7-10. Output amplifier 7~
The signal amplified by 10 is output as sound from speakers 11 to 14.

FIG. 5 shows the above-mentioned speakers 11 to 12 for the interior of an automobile.
14, this figure shows the car body as seen from above with the roof removed. In the figure, numeral 15 is the body of the car, and the arrow indicates the front of the car. The speaker 11 is placed at the right front inside the passenger compartment 15a of the vehicle body 15 to output the right channel forward signal as sound, and the speaker 12 is placed at the right rear inside the passenger compartment 15a to output the right channel rear signal as sound. output, speaker 13
is placed in the left front of the vehicle interior 15a to output the left channel forward signal as sound, and the speaker 14 is located in the vehicle interior 1.
By placing it at the left rear inside 5a, the left channel rear signal is output as sound. As a result, the vehicle audio device can generate a stereo sound field that spreads between the front and rear speakers in the vehicle interior from the two-channel stereo signal output to the speakers.

However, with such conventional vehicle audio devices, even when outputting signals related to human voices such as singing or speaking, the sounds are localized to the rear for occupants who are located at the front of the vehicle interior. Unlike the case with audio equipment, etc., it gives an unnatural feeling.

In order to avoid this, if you use the front and rear faders to increase the output from the front and decrease the output from the rear, moving the sound field across the face to the front, you will inevitably lose the width of the stereo sound field. .

(Object of the Invention) In view of the above-mentioned circumstances, the present invention is designed to localize the sound in front of the passenger located at the front of the vehicle interior when outputting a sound such as a human singing voice or speaking voice, thereby creating a stereo sound field. The purpose of the present invention is to solve the above-mentioned problems by improving a vehicle audio system so that voices can be heard with a natural sensation without impairing the spread of sound.

(Structure of the Invention) For this purpose, the present invention provides the above-mentioned vehicle audio system, which includes means for enhancing the level of a component corresponding to the input audio frequency band of the signal directed to the front speakers, and At least one of means for attenuating a component corresponding to the human voice frequency band of the signal directed to the speaker is provided.

(Example) Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention, in which the same parts as in FIG. 4 are designated by the same reference numerals.

In this embodiment, a cancel switch 16 is provided that allows selection of whether or not to insert a circuit that produces the effect of the present invention between the front and rear faders 6 and the output amplifiers 7 to 10 of the conventional vehicle audio system. and 200 Hz to 800 Hz of the input signal, which corresponds to the human voice frequency band.
17.19 and the above-mentioned 20082-800.
) Band elimination filters 18 and 20 are provided to attenuate only the signal of h. Cancel switch 16
The four changeover switches 16a to 16d are linked together, and the variable resistor 6a of the front and rear fader 6 is connected to the movable contact of the changeover switch 16a, and the variable resistor 6b is connected to the movable contact of the changeover switch 16b. A resistor 6c is connected to a movable contact of a changeover switch 16c, and a variable resistor 6d is connected to a movable contact of a changeover switch 16d. Further, one of the fixed contacts of the changeover switch 16a is connected to the input terminal of the equalizer 11, and the other is connected to the input terminal of the equalizer 11.
7 and the input terminal of the output amplifier 7. One of the fixed contacts of the changeover switch 16b is connected to the input terminal of the band elimination filter 18, and the other is connected to the input terminal of the output amplifier 8 together with the output terminal of the band elimination filter 18. Changeover switch 1
One of the fixed contacts 60 is connected to the input terminal of the equalizer 19, and the other is connected to the output terminal of the equalizer 19 and the input terminal of the output amplifier 9. Changeover switch 1
One of the fixed contacts 6d is connected to the input terminal of the band elimination filter 20, and the other is connected to the input terminal of the output amplifier 10 together with the output terminal of the band elimination filter 20. Furthermore, the output terminal of the output amplifier 7 is connected to the speaker 11, the output terminal of the output amplifier 8 is connected to the speaker 12, the output terminal of the output amplifier 9 is connected to the speaker 13, and the output terminal of the output amplifier 10 is connected to the speaker 14. Connect to. The speakers 11 to 14 are arranged in the same manner as in the conventional vehicle audio system shown in FIG.

The operation of the above embodiment will now be described. FIG. 1 shows a state in which the cancel switch 16 is turned off.

The left and right channel signals from stereo source 1 are Lch,
, Rch, are respectively supplied to input amplifiers 2 and 3 for amplification, the level is adjusted through a volume, and the signals are passed through a left and right balancer 5. The left and right channel signals that have passed through the left and right balancer 5 are divided into front and rear signals, respectively, and are passed to the front and rear faders 6.

Among these divided signals, the front signal is supplied to the equalizer 17.19 by the cancellation switch 16 for both left and right channels to amplify only the signal of 200 Hz to 800 Hz, which corresponds to the human voice frequency band, and to Band signals other than the band are passed through without increasing or decreasing, and after being amplified by the output amplifier 7.9, the speakers 11.13 output them as sound from the front left and right sides of the vehicle interior.In addition, the signals for the rear are canceled by the cancellation switch 16 for both the left and right channels. Band Eliminate Filter-18,20
Attenuates only the 200Hz to 800Hz signal through the filter, and passes other band signals without increasing or decreasing,
After amplification with output amplifier 8, 1o, speaker 12.14
The system outputs sound from the rear left and right sides of the vehicle interior.

Therefore, among the signals input from the stereo source 1, the 200 Hz to 800 Hz signal containing the audio is outputted while being amplified in the front and attenuated in the rear, so that the audio is localized in the front and the sounds in other frequency bands are It can be localized in the middle as before.

Note that if the signal input from the stereo source 1 does not contain audio, turning on the cancel switch 16 causes the movable contacts of the changeover switches 16a to 16d to switch to the other fixed contacts, respectively, and the equalizer 17.1
Amplifier 7 outputs the signal directly from front and rear faders 6 without passing through 9 and band elimination filters 18 and 20.
-10, so it can be operated in the same way as the conventional vehicle audio system.

2 and 3 are block diagrams showing two other embodiments of the present invention, in which the left side of the front and rear fader 6 is the first
Omitted as it is the same as the figure. In the figure, the same parts as in FIG. 4 are designated by the same reference numerals.

In the second actual M mode shown in FIG. 2, the changeover switch 16 of the cancel switch 16 in the first embodiment is
In place of the equalizer 17.a and 16c, disconnection switches 16e and 16f are provided, and the equalizer 17.19 is replaced with the above 20.
0) jz to 800 Hz, while at the same time attenuating signals in bands other than the frequency band, band pass filters 21 and 22 are used, and output audio can be shifted to the left or right. audio balancer 23
Further, mixers 24 and 25 are provided which mix, amplify, and output the front signal from the audio balancer 23 and the front signal from the front and rear faders 6. Only the right side of the variable resistors ea and 6c of the front and rear faders 6 differs from the first embodiment, so this part will be explained as follows.
The variable resistor 6a is connected to the movable contact of the disconnection switch 16e of the cancel switch 16 and also connected to one input terminal of the mixer 24, and the variable resistor 6c is connected to the movable contact of the disconnection switch 16[ and the mixer 25 Connect to one of the input terminals. The fixed contact of the disconnection switch 16e is connected to the input terminal of the bandpass filter 21, and the fixed contact of the disconnection switch 16f is connected to the input terminal of the bandpass filter 22.

The audio balancer 23 is a combination of variable resistors 23a and 23b, and the output terminal of the bandpass filter 21 is connected to the variable resistor 23a and the bandpass filter is connected so that the resistance values change with opposite slopes. 22
The output terminal of the variable resistor 23a is connected to the other input terminal of the mixer 24, and the variable resistor 23b is connected to the other input terminal of the mixer 25.

The output terminal of the mixer 24 is connected to the input terminal of the output amplifier 1, and the output terminal of the mixer 25 is connected to the input terminal of the output amplifier 9, and the subsequent configuration, connections, and speaker arrangement are the same as in the first embodiment. be the same.

Next, to explain the operation of the second embodiment, FIG. 2 shows a state in which the cancel switch 16 is turned off.

Among the signals from the front and rear faders 6, the front signals are divided into two for both the left and right channels, and one side is passed through band pass filters 21 and 22 by a cancel switch 16, and only the signals from 200H2 to 800H2 are passed.
One signal is supplied to a mixer 24.25 via an audio balancer 23, and the other is supplied to a mixer 24.25 for mixing and amplification. As a result, the 200Hz of the forward signal
Only for signals of ~800 Hz, the left and right channel levels can be balanced using the audio balancer 23.

The forward signals mixed and amplified by mixers 24 and 25 are supplied to output amplifiers 7.9 for both left and right channels, where they are amplified and then output as sound from the front left and right sides of the vehicle interior by speakers 11.13.

Of the signals from the front and rear faders 6, the rear signals are output as sounds from the rear left and right sides of the vehicle interior by attenuating only the signals of 200 Hz to 800 t (z) as in the first embodiment.

Therefore, in addition to the effect of the first embodiment, the second embodiment has the effect that the sound can be localized at a desired position between the front left and right speakers.

In a third embodiment shown in FIG. 3, the audio balancer 23 and mixer 24.25 in the second embodiment are replaced with left and right channel bandpass filters 21.
A mixer 26 for mixing and amplifying the forward signals from the mixer 22, an audio volume 21 for adjusting the level of the forward signals from the mixer 26, an output amplifier 28, and an auxiliary speaker 29 are installed in the configuration. .

Since only the right side of the variable resistors ea and 6c of the front and rear faders 6 is the same as the first embodiment, this part will be explained.The variable resistor 6a is connected to the movable contact of the disconnection switch 16e of the cancel switch 16. At the same time, the variable resistor 6C is connected to the input terminal of the output amplifier 7, and the variable resistor 6C is connected to the movable contact of the disconnection switch 16f and also connected to the input terminal of the output amplifier 9. The fixed contact of the disconnection switch 16e is connected to the input terminal of the bandpass filter 21,
A fixed contact of the disconnection switch 16f is connected to an input terminal of the bandpass filter 22.

The output terminals of the band pass filters 21 , 22 are respectively connected to two input terminals of a mixer 26 , the output terminal of the mixer 26 is connected to an audio volume 27 , and the audio volume 21 is connected to an input terminal of an output amplifier 28 . Further, the output terminal of the output amplifier 28 is connected to an auxiliary speaker 29, and the auxiliary speaker 29 is arranged between the front speakers 11 and 13.

The configuration, connection, and arrangement of speakers after the output amplifier 7.9 are the same as in the first and second embodiments.

Next, to explain the operation of the third embodiment, FIG. 3 shows a state in which the cancel switch 16 is turned off.

Among the signals from the front and rear faders 6, the front signals are divided into two for both the left and right channels, and one is passed through the band pass filters 21 and 22 by the cancel switch 16, and passes the 200H2 to 800Hz (7) signal. , and is supplied to a mixer 26 to mix and amplify the left and right channel signals.

The forward signal mixed and amplified by the mixer 26 is supplied to an output amplifier 28, amplified, and then output as sound by an auxiliary speaker 29 between the left and right speakers in the front of the vehicle interior.

Therefore, in addition to the effect of the first embodiment, the third embodiment has the effect of localizing the sound near the center of the front.

In addition, the above 2. In both the third embodiment, if the signal input from the stereo source 1 does not include audio, the cancel switch 16 is turned ON to disconnect the disconnect switch 16.
e. At the same time as 16f disconnects, selector switch 16
The movable contacts b and 16d switch to the other fixed contact, and directly output the signals from the front and rear faders 6 to the amplifiers 7 to 1.
Since it can be supplied only to 0, it can be operated in the same manner as the conventional vehicle acoustic device.

Furthermore, the cancel switch 16 in the first to third embodiments is turned ON-OFF by determining whether or not the input signal from the stereo source 1 includes an audio signal using a microcomputer with a voice recognition function. By doing so, it is also possible to have the effects of the present invention performed automatically.

(Effects of the Invention) Thus, the vehicle audio device of the present invention is provided with a circuit that can increase or decrease the signal level in the frequency band corresponding to the human voice frequency band, and the signal level included in the signal from the speaker located in front of the vehicle occupant is provided. Since the present invention includes at least one of means for increasing the signal level of the frequency band and means for decreasing the signal level of the frequency band included in the signal to the speaker located behind the vehicle occupant, human When outputting audio such as singing voices or talking voices, the audio is localized in front of the passenger located at the front of the vehicle interior.
It has the characteristic of allowing you to hear audio with a natural feel without compromising the width of the stereo sound field.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a first embodiment of the vehicle acoustic device of the present invention, FIG. 2 is a block diagram showing a second embodiment of the present invention, and FIG. 3 is a block diagram showing a third embodiment of the present invention. FIG. 4 is a block diagram showing a conventional device, and FIG. 5 is a plan view showing the speaker arrangement thereof. 1... Stereo source 2, 3... Input amplifier 4.
... Volume 5 ... Left and right balancer 6 ...
Front and rear faders 6a-6d...variable resistors 7-10.
28...Output amplifiers 11-14...Speaker 15...Vehicle body 15a...Vehicle interior 16...
・Cancel switches 16a to 16d...Changing switches 16e, 16f...Connection/disconnection switch 17.19...Equalizer 18.20...Band elimination filter 21,
22...Band pass filter 23...Audio balancer 23a, 23b...Variable resistor 24-26...Mixer 21...Audio volume 29...Auxiliary speaker. Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. In a vehicle audio system equipped with at least two speakers at the front and rear of the vehicle interior, a means for increasing the level of a component corresponding to the human voice frequency band of the signal directed to the front speakers, or a means for increasing the level of a component corresponding to the human voice frequency band of the signal directed to the front speakers, or 1. A vehicle acoustic device comprising at least one means for attenuating a component corresponding to a human voice frequency band of an incoming signal.